.img-clip-demo{
    .container{
        
        .cas {
            border: 1px solid #aaaaaa;
            display: block;
            margin: 0px auto;
            box-sizing: content-box;
            height: 300px;
            width: 300px;
            position: relative;
            top: 100px;
        }
    }
}
.ddd {
    height: 200px;
    width: 200px;
    // background-image: url(./gaoyuanyuan.jpg);
}